Authorize.Net is a payment gateway service that enables businesses to accept credit card and electronic check payments through their websites and mobile applications. It provides a secure platform for processing transactions, ensuring that sensitive customer information is protected. Founded in 1996, Authorize.Net serves a wide range of industries, from retail to e-commerce. The service offers various features, including fraud detection, recurring billing, and customer support, making it a popular choice for small to medium-sized businesses looking to streamline their payment processes.